Races

Humans

Not much explanation is necessary about this race. The main difference
between people of this world and the world of Slayers is the fact that the
people of Slayers can use magic. In the Slayers world, anybody can use magic.
However, there are differences in magic capacity, and just because a person
understands the theory behind Dragu-Slave doesn't mean he/she can cast the
spell. However, just by rote memorization, anybody can cast a low-level
spell like Lighting. A few individuals possess special abilities such as
Telepathy, Beast Mastery, and Prophecy.

Elves and Fairies

People of these race are generally more intelligent, have more special
abilities, and live longer than humans. They rarely show themselves to man.
The reason is because these people have been used in experiments
involving magic. Several races have become extinct because of this, and it is
understandable why they choose not to show themselves. Even Lina has only met
three Elves and a Nylpha. She has also seen Fairy Souls, said to be the souls
of elves. People who lead normal lives are highly unlikely to meet people of
this race.

Demi-humans and Monsters

Demi-humans have intelligence, but are different physically. The most
well-known demi-humans are beast-men, trolls, and goblins. Beast-men even serve as
mercenaries.
Monsters are beings that live in darkness, like Mazoku, and are physically
completely different. There are many groups of monsters, such as slimes (on the
lower end) and vampires (on the higher end). No mistake can be made that monsters
cause only harm and do no good towards humans.

Dragons

Excluding Mazoku, dragons are the strongest race. There are several types
of dragons. At the top are the Golden Dragons who are called 'Dragon Lords'
and have powerful magic and high intelligence. Then comes the Dimos Dragon's,
supposedly the strongest dragons, who live only in the Kataart Mountains.
Then come the White Dragons who don't have much strength (though they have
enough to be a threat to normal humans), but can speak the human tongue.
Further down, there are Plasma Dragons, Deep Serpents, Needle Serpents and
Mail Serpents, and numerous other types. In the words of Gourry, "They're all
just big lizards."

Dragons who can speak the human tongue are typically rather
gentle and won't attack people unless provoked. However, lower level dragons
that cannot speak are another story. Some will attack if simply eye
contact is made. These dragons do not have the ability to cast spells,
and are more similar to beasts in that they use brute strength. There are
many types of dragons, but on the most part they are not at odds with
humans; neither are they allies. Instead, they take a neutral position.

Animals and Plants

These are basically the same as what exist in this world (though in some areas,
there are very dangerous plants). The slight difference is that animals can have
"bonds" with certain people. Beast Masters can make animals obey their command by
force. On the other hand, people who have "bonds" with certain plants and
animals, by being friendly with those species, can ask them to do things.
For example, wildlife conservation groups can even have the ability to make plants
do favors for them. Naga has "bonds" with jellyfish and inchworms.

Gods

The only gods in the Slayers world are Flare Dragon Ceiphied and his
counterparts, the Earth Dragon Lord, Water Dragon Lord, Fire Dragon Lord, and
Sky Dragon Lord. One of these gods is worshipped in each of the various
temples and shrines. However, in Lina's world, the Gods' only presence is the
the Water Dragon Lord's knowledge, in the form of the Claire Bible, and the soul
of the Flare Dragon, residing within Lina's sister Luna. Basically, the Gods are of
no use to the average person.

Mazoku

The beasts of darkness that were born from Ruby Eye Shaburanigdu, Demon
King of the world. A totally alien race to not only humans, but all other
races. They have far superior magic. The way they're born to the way they
think, and even what they eat (Xelloss and Shayla who were in the form of
humans ate, but it is highly unlikely that the food was digested) are
different.